Printing telegraph



Oct. so, 192

L. M. POTTS PRINTING TELEGRAPH Filed Feb. 10, 1926 7 Sheets-Sheet l O O0 @QO I [area/ar- 100/55 Al. Pofls Oct. 30, 1928.

' 1,689,295 L. M. POTTS PRINTING TELEGRAPH Filed Feb. 10, 1926 7 Sheets-Sheet Oct. 30, 1928.

\ M. POTTS PRINITING TELEGRAPH '7 Sheets-Sheet 4 Mme/flan- 100/3 M P0753.

Oct. 30, 1928. 1,689,295

' L. M. POTTS PRINTING TELEGRAPH Fiied Feb.10, 1926 7 Sheets-Sheet 5 15; 1 EII /l/Amh.

lm emar tau/3 M. P0273 L. M. POTTS PRINTING TELEGRAPH .Filed Feb. 10, 1926 oepao, 1928.

7 Sheets-Sheet 6 lave/Mar.- [00/3 1 P0193 Patented Oct. 30, 1928.

UNITED STATES PATENT OFFICE.

LOUIS M. POTTS, OF TENAZELY, 'NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC CO]!!- PANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

PRINTING 'rnmienarn.

Application filed February of simple and rugged construction, reliable and eflicient in operation, and inexpensive to manufacture.

,A feature of the invention relates to a page printing telegraph receiver embodying a printing platen which is adapted to be moved against a typewheel for the effecting of the printing operation, and rotated for the paper feeding operation.

Another feature relates to the novel means utilizing a double pawl arrangei'nent for controlling the printing of upper case characters and for accurately stopping the typewheel in the printing position.

A further feature relates to an improved combination of devices in a printing telegraph receiver for effecting spacing between characters.

bodiment the invention contemplates the use of a single electromagnet responsive to line current impulses for controlling the selective setting of a rotating and a reciprocating translating mechanism.

An understanding of a preferred form of carrying out the invention may be had from the following description when considered in conjunction with the accompanying drawing wherein:

Fig. 1 is a plan view of the receiving printer with certain portions removedfor the sake of clarity;

Fig. 2 is a front elevation of the printer shown in Fig. 1.

10, 1926. Serial No. 87,228.

Fig. 3 is a partial left-hand elevation of the printer;

Fig. 4 is a right-hand end elevationof the printer;

Fig. 5 is a sectional-view of the printing platen and the rocking frame therefor viewe from the left-hand end; 1

Fig. 6 is a developed view of the rotatable selecting discs together with the pawls and cams for'rotating the discs in opposite directions;

Figs. 7 and 8 are schematic studies of the relation between the printing platen and the typewheel at different stages in the operation of printing a character;

Fig. 9 is a perspective representation showing the relation between the, disc and rod selectors; I

Fig. 10 is a detailed perspective view show- .ing the relation between the main shaft for rocking the platen and the various stunt operating slides;

Fig. 11 is a sectional representation of the friction clutch for driving the typewheel and distributor mechanism;

Fig. 12 is a sectional view of the clutch of Fig. 11 taken along the line 1212;

Fig. 13 is a detailed left-end study showing the relations between the ball discs and the special stunt slides;

Fig. 14 is a detail of the line feed controlling mechanism;

Fig. 15 is a detail of the mechanism for cf fecting spacing and return of'the printing carriage;

Fig. 15 is a view of the retaining arm for controlling the operation of certain stunt slides; a

Fig. 16 shows a retaining bar' similar to that of Fig. 15 for controlling the operation of other stunt slides;

- Figs. 17 and 17 a are details of the pawls for controlling the stopping of the typewheel.

manner in which incoming signal impulses cause the actuation of the double Wound printer selecting magnet.

The printer disclosed hereinafter is designed to be operated by various combinations of selective impulses with an additional impulse preceding each group of selec tive impulses for releasing the translating mechanism. The selective impulses may comprise units ofcurrent and no current. Accordingly the current units on. arriving over the line from a distant station, at which there is located suitable transmitting apparatus, pass through the winding of line relay 160 (Fig. 25) which in turn controls the windings of the printer selecting magnet 12. Vhen no signals are being received the armature of relay 160 is closed to its front contact thus energizing the upper winding of magnet 12 and maintaining armature 11 in engagement with lever 10. \Vhen signals are received the position of the armature of relay 160 is reversed which in turn causes the reversal of armature 11.

In the drawing there is shown a printing platen 53 adapted to be moved by arocking shaft 49 into printing engagement with the typewheel 127. The typewheel 127 which is mounted on a printing carriage is adapted to rotate about the main shaft 1. and to slide horizontally along the said shaft. This carriage carries spring pressed pawls which eooperate with a transverse toothed rack 72 to cause the printing carriage to be advanced step-bystep. The step-by-step movement of the carriage is performed against the tension of a spring 152 mounted in casing 151. hen

the above mentioned rack is out of engagement with the pawls and 71, the carriage, by means of cord 153 which passes around pulleys 154 and 155 and fastened to spring 152, is restored to its extreme left-hand position under the tension of said spring.

' The printer shown in the drawing is illustrated in combination with a keyboard trans mitter which comprises a series of key levers 108, a plurality of permutation bars 119, and a set of contacts 139 and 1 10 which are operated in accordance with the positioning of the permutation bars 119 under control of the key levers 108. A keyboard transmitter of this general type is described in detail in the patent to H. Pfannenstiehl N 0. 1,545,276 granted July 7, 1925.

Referring to the drawing, particularly to Figs. 2, 3 and 9, it is seen that'the distributing mechanism comprises five selecting rods 117 to 121, which are concentrically arranged about a portion of the circumference of the main shaft 1. These rods are slidably mounted in slots provided in ring 18 rigidly secured to the shaft 1 which is adapted to be driven by power from a motor 4 under control of the escapemen twheels 5 and 6 and the friction clutch 37. Consequently the selecting rods 117 to 121 rotate with shaft 1 and slide longitudinally thereon. The distribu tor timing and escapement mechanism comprises two toothed wheels 5 and 6 as shown in the exploded view of Fig. 24. Wheel 5 (Figs. 3 and 24) has three teeth, 0, d and e. Tooth d is separated by 90 from each of the teeth 0 and 0 while the teeth 0 and 0 are separated by 180?. Similarly wheel 6 has three teeth f, g and h, teeth and g being spaced 90 apart, and teeth /L .and apart. It will be noted that tooth f has a long high portion the function of which will be described hereinafter. \Vheels 5 and 6 are rigidly mounted on shaft 1 in the relation .the arm 14 which is appropriately secured to the fixed plate 21. Spring 8 has-one end secured to the balance-anchor 7 and the other end fastened to the arm 14. Spring 8 tends to hold the balance-anchor in such position that pallets 9 and 13 are equidistant from the axis of shaft 1. As mentioned above in the normal condition of shaft 1, armature 11 holds lever 10 against the elongated pallet 13. Consequently pallet 9 is held nearer the shaft than is pallet 13. In this condition pallet 9 engages tooth c of wheel 5 and holds shaft 1 against rotation.

When a start signal is received by magnet 12, armature 11 is moved out of alignment with lever 10 and under tension of spring 8 and anchor 7 swings, releases pallet 9 from engagement with tooth c and permits the shaft 1 to rotate one step. The front upper face of tooth 0 acts as a camming surface for pallet 9 thus giving the anchor an impulse to'continuc its original motion until pallet 13 engages tooth g on wheel 6. A little later anchor 7 swings in the reverse direction, releases shaft 1, and the upper front surface of tooth 9, gives the anchor animpulse to main: tain its motion in the reverse direction to that given by tooth (a This step-by-step rotation of shaft 1 continues, pallet-s S) and 13 coming into engagement with the teeth of their respective escapement wheels alternately hi the sixth step the long high part of tooth engages pallet 13 which a little later slips oil this tooth and engages the upper end of lever 10 which isnow held against rotation by means of armature 11.

During each step in the rotation of shaft 1, one of the sliding rods 117 to 121 is adapted to be selectively moved. The arn'iature 11 has its front edge bevelled as shown in Fig. 1

llu

for the purpose of deflecting the sliding rods to one side or the other of the locking plate 21 in accordance with the energization of magnet 12. Fastened toeach side of the plate 21 1s a deflecting wing 23 (Fig. 1). As the shaft 1 rotates step-by-step under control of wheels 5 and 6, the projecting portions of the rods slide along the surface of plate 21 until they reach the deflecting wings 23 whereupon they are forced into the center opening in plate 21 and come into the same plane therewith. The bevelled edge of armature 11 then cooperates with the bevelled edge of the slide to force the same to one side or the, other of the plate 21. As shown in Fig. 3 theslocking plate is slotted at its outer edge whereit is mounted on posts 25 for adjustment in a rotary direction for orientation so that the deflecting of the sliding rods by the armature 11. takes place at the proper time with relation to the incoming impulses, The slides 117 to 121 are spaced apart, therefore, when shaft 1 isrotated'about 180 the slides are positioned in a combination corresponding to the signal received by magnet 12 and will remain in their set posit-ion until the next revolution.

Each slide 117, 118 etc. is adapted to cause the rotation of a corresponding disc such as .110, 111, 112, 113 and 114. For this purpose the slides have a portion thereof bent over in the form of a curved arm or-=operating cam as 130 shown in. Fig. 6. The cam 130 cooperates with pawls 29 and 30 on disc 110. The. operating cam is so positioned on the second sliding rod 118 as to cooperate with corresponding pawls mounted on the second disc 111, and similarly for the cams on the remaining slides 119 to 121.

The printing position of typewheel 127 is determined by the setting of the five ball discs 110 to 114 inclusive, each disc being provided with two concentric rows of circular openings in which there are loosely fitted balls. The openings in the five plates are so arranged that for each character to be printed a particular set of five balls, one in each plate, are brought into alignment. to provide a rigid stop for the typewheel. In addition to the five ball discs 110, 111, etc. there is a front ball disc 27 and aback ball disc 26 each being divided into 27 sectors, 26 of the sectors having openings therein. Disc 27 is stationary being rigidly mounted on rods 121, 122, etc,

while disc 26 is capable of slight rotational displacement. For each one of the combina tions of positions of the five discs, 110, 111 to 114, corresponding to the 26 letters as pointedout above, there will be one 'sector in which the balls in the five discs are in alignment with one another and also with a ball in disc 27 and with a ball in disc 26. The balls in disc 26 are backed up by a solid plate 131 which is fastened to the main frame of the machine in any suitable manner. The alignment of a set of balls in response to a signal 7 series of rods 28 which are appropriately secured to the end plates 27 and 131. Each disc has pivoted on the opposite faces thereof pawls such as 29 and 30. Each pawl has a' pawl 30 is determined by the position of the The discs 110 to 114 are supportedon a associated rod depending upon the setting of said rod with regard to the locking plate 21. Referring .to Fig. 6, when a rod 117 is in its forward positionthe cam 130 thereon is 1 .adapted to engage with pawl 30 'on the associated disc 110 whereby this disc is rotated in the same direction as shaft 1. When the rod 117 is inits backward position, cam 130 engages pawl 29 and disc 110 is rotated in direction opposite to the directioh of rot-ation of shaft 1. Each of the five discs'110 to 114 inclusive, has a similar set of pawls, but each set is located 45 beyond the set on the preceding disc. Shortly after the fifth rod 121 has been set by armature 11 all the cams simultaneously engage one or the other of the pawls on the associated discs, thus allowing all the discs to be selectively positioned at the same time.

As shown in Figs. 3 and 9, each of the discs 110 to 114 has on its circumference two wedgeshaped notches 135 separated by'an angular distance equal to the angle the discs are moved.

ward edge of the universal bar 32 under tension of spring 33 enters-the notches in the discs and maintains the said discs in their ,last'set position. As shown inFigs. 2 and 9, concen trio withv the ring 18 in which"the rods 117 are slidably mounted and securely fastened thereon at the extreme forward end is ring 124 which has a cam shaped projection 147. This second ring is so mounted that the cam 147 engageslever arm 141, which is rigidly attached to universal bar 32, a short interval after the five rods 117, 118 etc. have been set. The continued movement of shaft 1, therefore, causes the removal of bar 32 from engagement with the notches in the selecting discs which may thereupon take their new Consequent-ly it is necessary for cams 130'to move the discs only slightly more than half acters, the upper case characters alternating with the lower case characters as shown in Figs. 1 and 2. The typewheel is slidably mounted on sleeve 35. For this purpose sleeve 35 has a slot cut thereinin which the clamping key 36 slidesa Clamp 36 not only keys the typewheel to sleeve 35 for rotation but also provides a connection between the sliding carriage arm 142 and the typewheel, thus allowing the printing carriage and the typewheel to be moved as a unit longitudinally.

Sleeve 35 normally tends to rotate due to the friction clutch 37 mounted on the right hand end of shaft 1. Rigidly mounted on the left hand end of sleeve 35 is an arm 38 which at its outer end has two holes in which are positioned balls 143 and 144 as shown in Figs. 2 and 4. The balls in arm 38 are at the same distances from the axis of shaft 1 as are the rows of balls in the selecting discs 110, 111, etc. and are adapted to cooperate with balls in alternate sectors of the discs. When arm 38 rotates with sleeve 35, balls 143 and 144 just ride freely in the space between plate 39 and the stationary disc 27 until either ball 143 or ball 144 engages a ball which is protruding from plate 27 due to the correspond ing balls in plates 110 to 114 being in alignment. Thus the sleeve 35 and typewheel 127 stop with the character on wheel 127 corresponding to the aligned balls not quite in the printing position.

Referring to Figs. 1, 2 and 4 the printing mechanism comprises besides typewheel 127,

- an ink reservoir 194. Suitably mounted on the sides of reservoir 194 is achannel-shaped member 146 having slotted projections wherein the inking roller 150 is resiliently mounted on springs 123. Suitable means such as a wick extending in the reservoir and bearing on the surface of the roller 150, may be provided.

Located on the lower left-hand end of the machine are bars 78, 91, 79, 98 and 101 pivotally mounted on a rod 185 suitably supported in the main frame of the machine. As shown in Figs. 13 to 16, the bars 79 and 101 are mounted for rotation only, while bars 78, 91 and 98 are adapted to slide as well as rotate on shaft 185. As shown more clearly in Figs. 10 and 18, these bars are arranged to be actuated by the special stunt slides 188 to 192 for controlling the special operations of the machine. Slides 188 to 192 as shown in Fig. 2 are positioned above the bars 7 8, 91, etc., and below the ball discs 110 to 114 and are adapted to be moved in a vertical direction against the lower edges of the ball discs.

When the discs are positioned in response to a special stunt signal, only one of the slides can enter notches in the discs. Slide 188 responds to a spacing signal, slide 189 to an unshift signal, slide 109 to a shift signal, slide 191 to a carriage return signal, and slide192 to a line feed signal. For the purpose'of economizing space,.the lower portions of the stunt slide are bent to the form shown in Fig. 18 where they cooperate with the bars 7 8, 91, etc.

Referring to Figs. 1,2, and 3 there is shown a motor 4 with its driving shaft geared to the main driving gear 3 which rotates in a clockwise direction when viewed from the right.

Gear 3 is made integral with 'theouter ring 57 of a ball bearing, while the inner ring 50 is securely fastened on a hollow stud 40 whose axis coincides with the axis of the platen roll when said roll is in its normal or rest position. Fastened to the right-hand face of gear 3 by means of rivets58 is a toothed disc 41. Keyed to the stud 40 and adapted to slide along a slot 161 therein is-an eccentric sleeve 42. Fastened to the left-hand face of eccentric 42 is atoothed disc 43 which is adapted to engage disc 41. A spring 44 loosely mounted on stud 40 with one end bearing against the adjustable collar tends to bring the disc 43 into engagement with disc 41 but these discs are held apart by the portion 162 of arm 45 which wedges between the toothed discs. For the purpose of preventing overthrow when the discs are wedged apart by arm 162, after the printing of a character, a lug 48 is rovided on disc 43. This lug has its tip ent in the form of a right angle and cooperates with a corresponding portion on arm 162 to provide a positive stop for disc 43.

At the extreme right of shaft 1 as shown in Fig. 4 there is rigidly mounted thereon a ring 163 having a projecting portion 47 in the form of a cam. The lever arm 45 is rigidly mounted on shaft 51 which is rotatably mounted in suitable supports (not shown).

Fastened to the opposite end of shaft 51 is shortly after shaft 1 is brought to rest by pallet 9, the cam portion 47 of ring 163 en- 7 gages arm 45 thus imparting a counter clockwise movement to shaft 51 whereby stop arm 162 is removed from engagement with stop lug 48. Spring 44 thereupon forces disc 43 into engagement with disc 41 resulting in the rotation of stud 40 and eccentric 42.

Rigidly fastened to shaft 49 is a rocker arm 50 in the bifurcated portion of which the resting position.

eccentric 42 is adapted to rotate. From an inspection of Figs. 4, 7 and 8 it will be noted that for each, revolution of eccentric 42, the platen 53 is first moved away from the typewheel, then into engagement with'the typewheel, and finally restored to its normal or Fig. 4 shows schematically the normal distance between the printing platen 53 and the typewheel when the machine is at rest. Fig. 8 shows the relative distance between the printing platen and the typewheel when eccentric 42 is rotated approximately 160". It will be noted therefore that during this portion of the rotation of a the eccentric, shaft 49 is rotated in a clockwise direction (viewing the machine from the right-hand end). Durlng approximately the next180 of rotation of the eccentric, shaft ,CllltCh 37 for the typewheel and distributor,-

tinuo usly', rotated by gear 3 on ball bearings 49 rotates counter-clockwise until the platen engages the typewheel as shown in Fi 7 During the remainder of the rotation of the eccentric shaft 49 is rotated slightly clockwise to restore the printing platen to its normal position.

Referring to Figs.v 1, 2 and 5 rotatably mounted on the shaft 49 but secure'against transverse motion are the end plates 54 which.

provide a frame for the platen. As shown schematically in Fig. 8 the platen supporting frame is held in its extreme downward positionaqainst stop pin 175 by means of spring 174. Tn this position the platen is far enough away froni the typewheel to avoid any marking of the paper by any ink that/may be on the typewheel and to allow suflicient time for the typewheel correcting mechanism to function before the platen moves to the printing position. Each of the plates 54 (Fig. 5) has a projection 136 punched therefrom and adapted to engagepins 134 projecting from the shaft 49. It is seen therefore that eccentric- 42 rotates approximately 320 before pin 134 engages lug 136 to move the platen toward the typewheel. The rocking of shaft 49 by means of eccentric 42 furnishes the power for printing, spacing and special stunts as will be described hereinafter.

Referring to Figs. 2,11 and 12 the friction is mounted as a single unit at the right-hand end of the machine and is enclosed within a casing 177. The friction discs are of three kinds, namely, driving discs 157, driven dlscs 156 and idler discs 167 arranged in the order shown in Fig. 11. A disc 158 carries lugs 159 riveted to a three-arm spider which is keyed to the typewheel driving sleeve 35. The spider ar'ms 159 engage correspondlng slots in discs 157 Theprojec'ting lugs of discs 156 are adapted to engage pins 170 securely fastened to gear wheel 2 which is conas shown, Springs 166 'compress the disc pile-up. *The'tension ofthese springs and the number of discs are so proportioned as to give the desired'rotary force to the distributor'shaft 1 and typewheel sleeve 35.

It is believed thata better understanding of the invention will be had. from a detailed description of the sequence of operations relating to the printing of a particular character.

Let it be assumed therefore that the distant station is transmitting a series of impulses for selecting the character D. Let it also be assumed that this character is selected by five units of the following order: current, no current, current, no current, no current. Before the transmission of the signal impulse it is necessary to-send a start signal by momenthe deenergization of line relay 160 thus clos-. ing a circuit for the lower winding of magnet 12 whereby armature 11 is withdrawn from engagement with stop .10. Lever in turn disengages pallet 13 and the'balance-anchor 7 is free to oscillate. Shaft 1 which isdriven through clutch 37, and. under control of anchor 7 has imparted thereto a corresponding movement. As hereinbefore. described for each oscillation of the anchor 7, the selecting rods 117 to 121 will be moved in astepby-step fashion. As the rods are thus rotated and upon their engagement with armature 11 they are deflected to 'one side or the other of plate 21. For the character D rods 117 and 120 are deflected to the right of plate 21 While the remaining rods are deflected to the left. Thus the disc operating cams 130 etc. are correspondingly positioned. Following the positioning of rod 121 cam 147 engages arm 141 and rotates the universal bar 32 to cause the disengagement of the same from the notches in discs 110 to 114 and to allow these discs to be positioned by the selecting cams. In this case cam 130 on bar 117 and the cam on bar 120 engage pawls 29 on their respective discs 110 and 113 while camson bars 118, 119 and 121 engage the pawls 30 of discs 111,112

and 114 respectively. The discs 110 and 113 balls 143 and 144 rotatesuntil pawl 143 engages the rigid stop provided by the new lineup of balls. Thus the typewheel is brought to rest with the character" D nearly in the printing position and shaft 1 comes to rest when pallet 9 engages tooth 0.

At aboilt the same time that the typewheel I :starts to rotate as mentioned above, cam 47- engages arm whereby stop arm'162 is removed from engagement with lug 48 and ec- .80 tarily opening the line circuit. This causes centric 42 begins to rotate under control of both discs 41 and 43 as described hereinbefore and shaft 49 is rotated clockwise by means of the rocking frame 50. However, the platen.

is not moved at this time since the platen supporting frame is held down against the pins 175 by the springs 174. For approximately the first 160 of rotation of eccentric 42 as explained hereinbefore, the platen remains stationary in its lowermost position. During the next portion of the rotation of the eccentric, shaft 49 is rotated counter-clockwise (viewed from the right-hand end) but the platen is not moved towards the typewheel until the pins 134 in shaft 49 engage the projecting lugs 136 on the platen frame. delay in the movement of the printing platen is for the purpose of allowing typewheel 137 to make a complete revolution if necessary. When lugs 136 are engaged, the further rotation of shaft 49 moves platen 53 towardsthe typewheel. As the platen is being I thus moved a rod 59 which extends transversely across the machine'and secured to the plates 54, disengages the pawls 60 and 61 and under tension of springs 62 both pawls move toward the center of the typewheel 127. Qn the left-hand face of wheel 127 as shown In Figs. 2 and 13, there are a series of lugs 67. As shown in Figs. 17 and 17*, when the typewheel is stopped,by arm 38 engaging the lineup of pawls. in the selecting discs, the typewheel is not quite in the printing position and both pawls are ready to engage lugs 67. When the typewheel again moves as described hereinafter, as indicated by the arrows pawl 60 will be the first to engage a lug on wheel 127 and said wheel will be stopped in a position to print the lower case character D. When an upper case character is to be printed, pawl 61 alone moves into cooperative relation with the lugs 67 and consequently the typewheel is stopped in a position to print an upper case character as will be described in detail hereinafter. Pawls 60 and 61 not only function to select an upper case or a lower case character but also perform the functions of the usual type correcting mechanisnras will appear later.

The back disc 26 (Figs. 9 and 13) is under tension of spring 145, so that projection 172 thereon engages bar 120. During the first portion of the rocking of the shaft 49, bar 64 is moved to the right causing link 65 to ride idlyalong pin 66 in disc 26. The .disc 26 remains in the position shown until the typewheel 127 is positioned in accordance with the setting of bars 117 to 121. During this position of disc 26 the selecting discs 110 to 114 are held in their set position by means of bar 32 which engages notches in the said discs as hereinbefore described. During the second portion of the rocking of shaft 49, link 65 moves in the opposite direction and near the This the first to engage a lug 67 on typewheel 127 and further movement of the typewheel is prevented. The character D is now exactly in the printing position and the platen 53 forces the paper against the typewheel to make an impression. During the third por tion of the revolution of eccentric 42, shaft 49 (Fig. 13) is rotated slightly counter-clockwise thus causing theprinting platen to move away from the typewheel. While the platen is returning from the printing position to its stopping position rod 59 engages pawls 60 and '61 and removes them from engagement with the typewheel. While the printing platen is thus being moved away from the typewheel universal bar 64 movesto the ri ht causing link 65 to disengage pin 66 whergloy disc 26 is restored to its original position under tension of spring 145. When the eccentric 42 has thus made a complete revolution, stop arm 162 is wedged between discs 41 and 43 and engages the stop lug 48 thus bringing eccentric 42 to rest. The selecting mechanism is now in readiness to respond to impulses corresponding to the next character to and 15 the typewheel 127 is adapted to slide, in a slot in sleeve 35 to form spaces. Mountedv on the printing carriage is a frame 69 carryingtwo projecting pins 178 and 179 on which are loosely mounted pawls 70 and 71 respectively. Normally pawl 70 is at about anangle of 45 with rack 72, while pawl 71 has its long portion substantially parallel to the rack.

Bot-h pawls 70 and 71 are adapted to engage a the teeth in rack 72. Rack 72 has three positions as shown in Fig. 15. lVhen the rack is in its lowest position pawls 70 and 71 are out of engagement and rest against their respective stops 181 and 182. In the middle or normal posit-ion of the rack, pawl 71 engages the same and holds the printing carriage against the tension of cord 153. WVhen the rack moves to its uppermost or spacing position pawl 70 turns on pin 178 and forces the printing carriage one step to the right. Rack 72 then returns to its middle position and the printing carriage is held by means of pawl 71.

Rack 72 extends across the machine and is securely fastened to arms 7 3 (Fig. 10) which are loosely mounted "on shaft 74. Near the left-hand end of shaft 74 there is loosely mounted thereon an arm 75 which has an extension 184 adapted to engage a corresponding notch in bar 78. The arms 75 and 73 are coupled together by means of notches 209, thus longitudinal movement of bar 78 is translated into rotary motion of arms 75 and 73. With shaft 49 in its normal position as shown more clearly in Fig. 15, the lower portion of arm 64 is in engagement with notch 85 in bar 7 8. It will be noted that bar 78 is held forward against the tension of spring 186 by means of arm 75 (Fig; 10) which in turn is held forward in 'the position shown by means of notch 190 in bar- 79. \Vhen a character is to be printed shaft 49 is rotated as already described causing arm 64 to engage notch 85 to move bar 78 to the right. Bar 78 by means of the projection 184 causes arms 75 and 73to be rotated whereby the rack 72 is moved to its uppermost spacing position. Paw] is therefore rotated and the printing carriage is moved to the. right until holding pawl 71 engages the next tooth of the rack. Shaft 49 then rotates in the opposite direction and allows arms 78 and to move to the left until arm 75 engages notch- 190 whereupon rack 72 is stopped in its middle or normal position.

In addition to selecting and printing the various characters and providing means for spacing between characters there are other auxiliary mechanical operationsto be performed, for example, spacing between words, carriage return, line feeding, shift and unshift. Referring to Figs. 1, 2, 6 and 13, at the lower edge of discs 110 to 114 inclusive, appropriate notches, 211 are cut so that when these discs are set for a particular operation, such as spacing between words, there will be an alignment of slots in all five discs. opposite to a particular slide. In this case all the stunt slides except slide 188 have lugs 193 projecting from the left-hand edges as shown clearl in Fig. 18. In the normal positionof sha t 49, universal bar 87 (Fig. 13), which is pivotally mounted on a projection of arm 64, engages the lugs 193 on the stunt slide and holds these slides in their lowermost position. When a special stunt signal is received shaft 49 rotates the same as for printing, moves arm 64 tothe right whereupon universal bar 87 is disengaged from the stunt slides, allowing the proper slide to move into the aligned notches in discs 110 to 114.

When a carriage return signal is received, discs 110 to 114 are set so that there-is a slot in each of the discs opposite the edge of slide 191. When shaft 49 rocks, the universal bar moved to the left whereby the rack 72 moves to its'lowermost position. Undertension of cord 153 the printing carriage therefore slides to the left of the machine and comes to rest. The rack remains in its lowest position until the first spacing operation takes place whereupon shaft 49 is first rocked so that arm 64 engages notch 90 in bar 78 and moves said bar to the right. Arm 75 also moves with bar 78 until said bar. clears notch 190. The rack is then in its middle position and bar 78 drops so that notch 190 holds arm 75 to the right against the tension of spring 186. When the next printing operation takes place arm 64 engages notch 'instead of notch and spacing takes place as already described.

When a line feed signal is received, there is an alignment of slots opposite slide 192. VVh'en arm 64 (Fig. 14) moves to the right during the first rocking motion of shaft 49, notch 84 of bar 91 is cleared. Bar 91 is therefore rotated until the upper edge comes in engagement with the arm 64. During the reverse rocking motion of shaft 49, arm 64moves to the left and carries with it bar 91 and the bell crank lever 93, the lower extremity of which is in engagement with notch 212 of bar 91. The upper arm of the bell crank lever terminates in the form of a geared sector which engages corresponding teeth on the arm 94 which is rotatablymounted on the platen roll shaft. Arm- 94 carries the spring movement caused by pawl 95 may be varied.

Referring to Figs. land 2, knobs 102 are provided at both ends of the platen roll to allow the paper being fed by hand. The shank 103 of the knob is mounted in the hollow stud 40 which carries the toothed disc 43. The inner end of shank 103 is counter-bored and slotted. A connecting link 104 has a pin in each end, the pins being positioned at right angles to each other. One of the pins fits in slot 107 while the other pin fits in slot 105.

By means of this arrangement the platen ters on its face.

roll can oscillate without moving the knobs 102. Referring to Fig. 5, the paper 39 passes around the platen roll 53 and is held against it by the pressure rolls 62. Short spring pressed rolls 65 are provided at each end of the platen to hold the paper close to the platen at theprinting point so that the paper clears the typewheel after the platen is moved only a short distance away.

The typewhcel has a single row of charac- The characters printed in the shift position alternate with those printed in the unshift position. The wheel may be considered divided into 54 parts, 52 of these parts being used for the printing of characters and the remaining two'positions corresponding to the stunts. A special stopping device is provided to stop the typewheel in the same position whenever a stunt is to be performed. There are no characters on the typewheel in these latter two positions and the typewheel, as shown in Fig. 5 is cut away so that nothing is printed even though the platen roll is advanced toward the ty wwheel. When a shift signal is received. there is a slot in each of the discs opposite the upper edge of slide 109. As shown in Fig. 18, the lower edge of slide 109 when in its normal position bears on the upper edge of bar 98 holding .down the same against the tension of spring 214 (Fig. Spring 214 also serves to hold bar 98 so that notch 216 is in registration with projection 215 0119111'1 99. and notch 217 is in registration with projection 218 on arm 64. lVhen slide. 109 is raised as above described, bar 98 moves upwardly with said slide and arms 64 and .99 engage notches 216 and 217, respectively. lVhen shaft 49 rocks, arm 64 moves to the right carrying with it ba'r 98and arm 99 until the lower end of arm 99 engages notch 219 in the lower edge of bar 101 thus holding bar 98 and arm 99 in a forward position. Securely fastened on shaft 74. and extending across the machine is a universal bar 116 (Figs. 10.and 13). It will be noted that pawl has a downwardly projecting portion 115 which engages universal bar 116 when the latter is in its forward position and prevents pawl 60 from being moved by spring 62 when bar 59 disengages the pawls. Thus pawl 61 alone can move into engagement with lugs 67 to stop the type wheel in a position to print an upper case character. Bar 116 is held in its forward position until an unshift signal is received.

lVhen an unshift signal is received, slide 189 moves upwardly and the projection 221 in the lower end thereof engages bar 101 and mo es the latter upwardly. Arm 99 is thus disengaged from notch 219 and bar 98, together with arm 99, is therefore free to move to the left to disengage universal bar 116 from the extension ofpawl 60. Thus the typewheel may he stopped in a position to print a lower case character.

there are projections 197 which engage arm 198 riveted to slide 196, so that upward move ment of any of these slides causes slide 196 also to be moved upwardly into the path of the arm 38. Slide. 196 also has at its lower end a notch (F ig. 2) which engages a hp 199 onhar .78 thus moving the latter upwardly. The

raising of bar 78 thus prevents the spacing operation from taking place. Spacing slide 188 also .has a projection 55 at its upper end for stopping the typewhecl in its blank position when the spacing operation occurs.

The keyboard comprises a series of key levers 108 and a series of longitudinal slidable code bars 119. The key levers are adapted to act on the lower edges of the code bars to move them one way or the other-"in accordance with the direction of slope of the notches therein. In addition to the code bars a start bar 120 is provided which is adapted to be moved to the right whenever any of the keys are depressed. Referring to Figs. 1, 2 and 4 sending cams 201 to 206 are mounted on the right-hand end of the distributor shaft 1. These sending cams comprise five code cams 202 to 206 and the start control cam 201. Bell crank levers 164 to 169, inclusive, are adapted to engage each cam respectively. The arrangement of the cams on shaft 1 is such as to operate levers 164 to 169 in succession, so thatfor every 45 degrees of rotation I of shaft 1 an impulse is sent out. The start control cam 201 operates the start bell crank 164 just after the fifth code cam 202 operates its corresponding bell crank and just before the distributor shaft comes to rest. Referring to Figs. 19 to 23, universal bar 125 is pivoted in a bracket 126 which is appropriately fastened to the keyboard frame. Universal bar 125 at one end engages the start control lever 164 and at the other end has a knife edge projection 136 which may engage one side or the other of a wedge-shaped projection 127 on the upper edge of each of the bars 119. Referring toFig. 21 when no keys are depressed, the slide 120 is held towards the left by means of spring 129. The trip cam 128 in this condition rests against the end of slide 120 and the lip 137 on bar 125. The tip of slide 120 therefore holds the left end of bar 125 down and prevents the knife edge 136 from entering the notches in the code bars on the tension of spring 130. The universal bar 176 is mounted underneath and on the same pivot as bar 125. On the righthand end of bar 176 five levers 187 are pivoted. The projection 90 on the lower edge of each of the bars 187. is adapted to engage .the beveled portion on the upper edge .of the above. Bar 125 engages the left-hand end of bar 176 and an insulating projection 138 on bar 17 6 holds contact 139 in engagement with contact 140. When a key is depressed as shown in Fig. 22, bar 120 moves to the right the tip of slide 120, then disengages the lip 137 on the universal bar 125. Under tension of spring 135 bars .125 and 17 6 rotate and the contacts 139 and 140 are opened. When bar 125 thus moves, knife edge 136 engages wedge ,127 and locks the code bars 119 so that no other key can be depressed until the particular code signal set up has been transmitted. The opening of contacts 139 and 140 may, through suitable circuits, Operate magnet 12 in such a way as to release the escapement and timing mechanism on the left-hand end :of shaft 1, and shaft 1 starts to rotate. Shaft 1 in rotating in step-by-step movement as hereinbefore described causes cams 202 and bar 176 is rotated to close contacts 139 and 140. Each character or stunt signal is therefore determined by the number of times and sequence of closings of contacts 139 and 140 during each revolution of the distributor.

After all the code cams 202 to 206 have acted, cam 201 engageslever 164 and depresses bar 125 far'en'ough to allow trip lever 128 to engage said bar to hold the left-hand end thereof in a downward position. Under 7 tension of spring 129, trip lever 128 snaps over the projection on bar 125 in case the same key is still depressed. When this key is released start bar 120 restores to its righti hand position. Thus lever 128 prevents more than one code signal from being sent if the same key is held down continuously.

What is claimed is: 1. In a printing telegraph receiver, a rotatable and axially movable typewheel. a

main driving shaft, a printing platen, means controlled by said shaft for imparting-a rpcking motion to said platen to bring the paper into engagement with said typewheel, and

means for rotating said platen to feed the paper forward.

2. In a printing telegraph receiver, a typewheel, a main driving shaft, a rocking shaft, a paper carrying printing platen mounted on said rocking shaft, means for imparting power to said driving shaft to rotate said typewheel into a selected position, means controlled by the motion of said driving shaft for imparting power to said rocking shaft to move the paper into printing engagement with said typewheel, and means for rotating. said platen to advance the paper.

3. In a printing telegraph receiver, a rotatable typewheel, a main driving shaft for said typewheel, a printing platen, a second shaft on which said platen is mounted, means controlled by said first shaft for imparting to said second shaft a plurality of motions to move said platen into printing engagement with said typewheel and for disengaging said platen and said typewheel when the printing operation is completed, and means responsive to different rotations of said second shaft for rotating said platen in'a single direction to feed the paper forward.

4. In a printing telegraph receiver, a" typewheel, a main driving shaft for=said typewheel, a printing platen, a second shaft, on which said platen is mounted and an eccentric for imparting a rocking motion to said second shaft to move said platen into and out of engagement with said typewheel, said eccentric being also effective to rotate said platen for line feeding.

5. A receiving printer, comprising a rotatable type wheel, means for selectively positioning said typewheel, to bring a desired character into a printing position, a paper platen, a main shaft on which said typewheel is mounted, an eccentric sleeve for moving said platen away from said typewheel while the same is being positioned and for moving said platen into printing engagement with said typewheel when the same has been positioned, said sleeve being also effective to with-' drawsaidplaten from saidtypewheel after the desired character is printed, and means comprising a selectively operable bar and a ratchet on said platen for rotating said platen for the line feeding operation.

6. A receiving printer, comprising a main rotatable shaft, a plurality of rotatable selecting elements, and a corresponding plurality of slidable selecting elements mounted on and adapted to rotate with said shaft, a typewheel also mounted on said shaft normally restrained from moving therewith, a paper platen, a second shaft on which said platen is mounted, means responsive to im ulses received for selectively positioning said rotatable and slidable elements, means effective when said elementshave been positioned for allowing said typewheel to rotate to bring a desired'character thereon into a printing po- 55 isreceived for preparing only one of said sition, and means effective upon the position- .ing of said typewheel for rocking said second shaft to move said platen away from and subsequently intoprinting engagement with said typewheel.

7. Areceiving printer comprising a main driving shaft, a typewheel slidably and rotatably mounted on said shaft, said typewheel being provided with characters arranged in groups, and means comprising a plurality of rotatable and slidabletranslating devices mounted on the same shaft with said typewheel to select a particular group of characters and subsequently to bring a particular character in the selected group into the printing position.

8. A receiving printer, comprising a main driving shaft, a typewheel rotatably mounted on said shaft and provided with a single row of characters arranged in groups, a plurality of teeth on said typewheel equal in number to the number of groups of characters, a plurality of stopping pawls adapted to engage the teeth on said typewheel, means effective independently of said pawls for stopping said typewheel to select a particular group" of characters, and means for selectively operating one of said pawls to engage a tooth in said typewheel to arrest the same in a position to bring a particular character in said particular group into a printing position.

9. A receiving printer, comprising a dr1v- .ing shaft, a typewheel mounted for rotation on said shaft, having a single row of characters and a plurality of teeth thereon, rotatable and slidable translating devices mounted for rotation on said shaft, a second shaft carrying a plurality ofpa-wls adapted to engage the teeth of said typewheel, a printing platen mounted on said second shaft, and

I means responsive to the reception of a special code combination of impulses for positioning said translating devices to render a particularone of-said'pawls effective to engage teeth 45 onsaid'typewheel.

10. In a receiving printer, the combination I 7 a of a typewheel having a. single row of characters arranged in groups, each 'prising a shift and an unshift e aracter,'a

oup complurahty of pawls adapted to engage said typewheel to arrest'the same in a shift or an unshift position, means effective when an unshift signal is received for preparing both of said pawls for engagement with said type-- wheel, and means effective when a shift signal spacing signal for causing movement of saidspacing pawl about its pivot to advance said carriage in a step-by-step movement.

12. In a receiving printer, a main shaft, a printing carriage arranged for longitudlnal movement along said shaft, a toothed rack,

arranged transversely of the machine, a printing carriage adapted to move parallel to said rack, a spacing pawl having one end pivotally attached to said carriage the other end adapted to cooperate'with said rack said pawl being so mounted that the line joining the tip and pivot thereof makes substantially an angle of 45 with said rack, a holding pawl having one end pivotally attached to said carriage the line joining the tip and pivot of said last pawl being substantially parallel to said rack, and means for moving said rack against said pawls to change the angle of'cooperation of said spacing pawl with said rack whereby said carriage is moved in a direction parallel to said rack.

14. In a printing telegraph receiver the combination of a main power shaft, a type wheel, a plurality of slidable selecting rods, a plurality of translator plates, said typewheel, said rods and said plates being concentrically arranged about the axis of said shaft and adapted to be rotated with said shaft.

15. In a printing telegraph receiver the combination of a continuall rotatin main shaft, 9. typewheel, a plura ity of se ectin rods, a plurality of translator plates eac carrying loosely mounted members, there be- =1ng one plate for each of said rods, said typewheel, said rods and said plates being arranged concentrically with regard to the axis to bring a desired character thereon into the printing position.

16. In a printing telegraph receiver, a single selecting magnet responsive to code current impuls s received, a rotatable shaft, selecting members mounted for rotation by said shaft and adapted to slide along said shaft, impulse translating mechanism concentric with regard to said selecting members comprising plates each individual to a selecting member and adapted to be rotated with said chanical devices to. be selectively set by re-,

ceived'combinations of c1 1rrentimpulses, and means responsive-to the receipt of a partlcular combination of impulses for setting said dev1ces-to determine the effectiveness of said 'pawls in controlling the stopping of said typewheel inres-ponse to the reception of succeeding impulse combinations;

18. In a telegraph receiving printer, a typewheel having a single row of characters, a plurality-pfpawls adapted to engage said typewheel-to stop the same in the correct printing positlon, both p'awls being adapted to engage" said typewheel when ajlowercase character is to be printed and one of said pawls only being moved when an upper case character is to be printed, means responsive to the reception of a particular combination of current impulses forrendermg-one of said pawls ineffective to engage said typewheel upon-the reception of succeeding lmpulse combinations representing characters .to be 36 printed.

19. In a tele raph receiving printer, a main shaft, a rst set of selecting devices adapted to slide on and to rotate with said shaft, means responsive to received current impulses for correspondingly positioning said first devices, a second set of selecting de' vices. concentric with saidshaft, means fOl rotating said shaft, and means on each device of said first set adapted to cooperate with a corresponding device of said second set to tation as that of said shaft or in the opposite direction to the rotation of said shaft.

20. In a telegraph receiving printer, a r0- tating shaft, a typewheelmounted for rotation with said shaft, a plurality of slidable rods mounted for rotation with said shaft, each rod having two selecting positions, an operating cam carried by each rod, a'disc associated with each of said rods concentri cally mounted about said shaft and adapted to be setin combinations, each corresponding to a character on said typewheel means responsive to received current impulses for positioning each of said rods in sequence, and means on each vof said discs effective when the associated rods are in one position to rotate said discs with saidshaftand effective when said rods are in another position torotate said discs in a direction opposite to the direction ofrotation of said shaft.

In witness whereof, I hereunto subscribe w my name this 8th day of February, A. D., 1926'.

- LOUIS M. POTTS.

rotate the same in the same direction of ro- 

